PSI - Issue 64

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 64 (2024) 1339–1346

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Adaptation of the pipeline supporting structure into a footbridge

using FRP deck with SHM Maciej Kulpa a* , Tomasz Siwowski a "Rzeszow University of Technology, Powstancow Warszawy 12, Rzeszow 35-959, Poland"

Abstract In order to create a convenient pedestrian and bicycle crossing along the existing road bridge, the city authorities decided to adapt the existing heat pipeline supporting structure, located next to the road bridge, for this purpose. The three-span supporting structure was built in 1975 in the form of two steel plate girders, braced with crossbeams, on which a heat pipeline consists of two pipes with a diameter of 100 cm, was placed. To adapt the existing steel structure to the new live loads, the steel girders were strengthened by increasing their cross-section and depth. Furthermore, to minimise the dead load of the structure after reconstruction, lightweight FRP composite panels were used as a deck slab for the new footbridge. The FRP panels were connected to the steel girders by special connectors, but without the composite action between the steel girders and the new deck. Due to the use of new material for the deck slab, the city administration required the implementation of a monitoring system to control the technical condition of the panels. Therefore, the structural health monitoring (SHM) system based on distributed fibre optic sensing (DFOS) technology has been implemented in FRP panels. DFOS enables continuous measurements to be acquired along the entire length of the structure, which is particularly crucial for these types of bridge decks. Before the new footbridge was put into use, a superstructure proof load test was carried out to verify its load-bearing capacity and to check the operation of the monitoring system. The article presents the method of reconstruction and strengthening of the existing steel structure, the DFOS-based monitoring system as well as the results of the proof load test and the control of the monitoring system. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: steel strengthening; FRP panel; distributed fiber optic sensing; SHM © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

* Corresponding author. Tel.: +48-17-865-10-22; fax: +48-17-854-12-60. E-mail address: kulpa@prz.edu.pl

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 10.1016/j.prostr.2024.09.369